The water shortage crisis is one of the challenges facing the world today. Recently, there has been a strong need for green space development in cities. Due to water restrictions, allocating water to green space is in sever competition with other applications such as agriculture, industry and even drinking water. Therefore, the water allocated for irrigation of green space has a great value and it should be used optimally and with high efficiency. In this regard, wastewater can be considered and consumed as a potential source of water. Sub-surface irrigation is a proper method for using wastewater. In Sub-surface irrigation, the groundwater level is stabilized at a certain depth from the root, so that the water rises through the capillaries in the soil and reaches the roots of the plant. As a result, it reduces the concerns caused by direct contact of workers with applying wastewater. This amount of rising water is called the capillary fringe. So far, many mathematical relationships have been proposed to measure capillary rise using different soil characteristics. The presentation of the mathematical model of capillary height for each soil texture has not been reported so far based on the physical and mechanical properties of the soil. In this research, the physical and mechanical properties of the loamy soil were measurel including: percentage of clay, sand and silt, saturated hydraulic conductivity, soil liquid limit(LL), plastic limit(PL), shrinkage limit(SL), porosity, grain solid density ,coefficient uniformity(CU), curvature coefficient(CC) in 10 treatments. Then capillary height at two levels of 100% ? max and 50% ? max , for drinking water and treated effluent, were measured. All experiments were performed with three replications. Finally, mathematical models were obtained using pedo-transfer functions(PTF S ). To create the desired pedo-transfer functions, the first part of the analysis involves selecting the best and most appropriate explanatory variables to be included in the regression. This choice was made using correlation analysis between independent variables and dependent variables. A correlation between independent variables was also investigated to prevent multiple correlations. After reviewing the correlation using SAS software and stepwise regression method, appropriate regression equations were adjusted to the data. Fitted model for drinking water capillary in soil with 50% of maximum dry density, the multivariate model was obtained without a constant value using the percentage of clay, sand and silt. The fitted model for the drinking water capillary rise in soil with 100% of maximum dry density and wastewater capillary in the soill with 50% and 100% of maximum dry density, the model of Polynomial display without constant value and using the percentage of clay were obtained. Key words: Pedo-transfer function, Saturated hydraulic conductivity, Atterberg limits, Porosity, Grain solid density, Coefficient uniformity , Curvature coefficient.